1. University of Groningen University Medical Center Groningen Department of Paediatrics – Developmental Neurology Groningen the Netherlands
2. University of Groningen University Medical Center Groningen Department of Epidemiology Groningen the Netherlands
3. University of Groningen University Medical Center Groningen Department of Rehabilitation Medicine Center for Rehabilitation Groningen the Netherlands
4. Rehabilitation Center ‘Revalidatie Friesland’ Beetsterzwaag the Netherlands